There is lots of material available for photography and i can highly recommend it. Don’t look for digital stuff, just a raw explanation of how light affects surfaces: hard light, soft light, light modifiers, big light sources, small light sources, position: front light, fill, strip light, etc.
If you know some Blender basics you can immediately put this into practice: https://www.youtube.com/watch?v=AO1wS1Yr0Wo
The simplest advice is: never put the main light in front or on top. It has to come from an angle to create shadow and thereby depth.